World Library  
Flag as Inappropriate
Email this Article

Hydrobromic acid

Article Id: WHEBN0000601834
Reproduction Date:

Title: Hydrobromic acid  
Author: World Heritage Encyclopedia
Language: English
Subject: Gold(III) bromide, HBr, Bromous acid, List of MeSH codes (D01), Acid strength
Collection: Acids, Bromides, Mineral Acids, Nonmetal Halides
Publisher: World Heritage Encyclopedia

Hydrobromic acid

Hydrobromic acid
ChemSpider  Y
EC number 233-113-0
Jmol-3D images Image
RTECS number MW3850000
Molar mass 80.91
Appearance colorless/faint yellow liquid
Odor acrid
Density 1.49 g/cm3 (48% w/w aq.)
Melting point −11 °C (12 °F; 262 K) (47–49% w/w aq.)
Boiling point 122 °C (252 °F; 395 K) at 700 mmHg (47–49% w/w aq.)
221 g/100 mL (0 °C)
204 g/100 mL (15 °C)
130 g/100 mL (100 °C)
Acidity (pKa) −9[1]
Viscosity 0.84 cP (-75 °C)
29.1 J/K mol
198.7 J/K mol
-36.3 kJ/mol
Safety data sheet ICSC 0282
Corrosive (C)
R-phrases R34, R37
S-phrases (S1/2), S7/9, S26, S45
NFPA 704
Flash point Non-flammable
Related compounds
Other anions
Hydrofluoric acid
Hydrochloric acid
Hydroiodic acid
Related compounds
Hydrogen bromide
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
 N  (: Y/N?)

Hydrobromic acid is a strong acid formed by dissolving the diatomic molecule hydrogen bromide (HBr) in water. "Constant boiling" hydrobromic acid is an aqueous solution that distills at 124.3 °C and contains 47.6% HBr by weight, which is 8.89 mol/L. Hydrobromic acid has a pKa of −9, making it a stronger acid than hydrochloric acid, but not as strong as hydroiodic acid. Hydrobromic acid is one of the strongest mineral acids known.


  • Uses 1
  • Synthesis 2
  • References 3
  • External links 4


Hydrobromic acid is mainly used for the production of inorganic bromides, especially the bromides of zinc, calcium, and sodium. It is a useful reagent for generating

  • International Chemical Safety Card 0282
  • NIOSH Pocket Guide to Chemical Hazards
  • Carlin, W. W. U.S. Patent 4,147,601

Media related to at Wikimedia Commons

External links

  1. ^ Bell, R.P. The Proton in Chemistry, 2nd ed., Cornell University Press, Ithaca, NY, 1973.
  2. ^ Dagani, M. J.; Barda, H. J.; Benya, T. J.; Sanders, D. C. (2005), "Bromine Compounds",  
  3. ^ a b Scott, A. (1900). "Preparation of Pure Hydrobromic Acid". Journal of the Chemical Society, Transactions 77: 648–651.  
  4. ^ a b Brauer, Georg (1963). Handbook of Preparative Inorganic Chemistry Vol. 1, 2nd Ed. Newyork: Academic Press. p. 285.  


Hydrobromic acid is available commercially in various concentrations and purities.

Using more concentrated sulfuric acid or allowing the reaction solution to exceed 75 °C further [4]

H2SO4 + KBr → KHSO4 + HBr

Alternatively the acid can be prepared with dilute (5.8[4]

Hydrobromic acid has commonly been prepared industrially by reacting bromine with either sulfur or phosphorus and water. However, it can also be produced electrolytically.[3] It can also be prepared by treating bromides with non-oxidising acids like phosphoric or acetic acids.

More typically laboratory preparations involve the production of anhydrous HBr, which is then dissolved in water.

Br2 + SO2 + 2 H2O → H2SO4 + 2 HBr

Hydrobromic acid can be prepared in the laboratory via the reaction of Br2, SO2, and water.[3]



This article was sourced from Creative Commons Attribution-ShareAlike License; additional terms may apply. World Heritage Encyclopedia content is assembled from numerous content providers, Open Access Publishing, and in compliance with The Fair Access to Science and Technology Research Act (FASTR), Wikimedia Foundation, Inc., Public Library of Science, The Encyclopedia of Life, Open Book Publishers (OBP), PubMed, U.S. National Library of Medicine, National Center for Biotechnology Information, U.S. National Library of Medicine, National Institutes of Health (NIH), U.S. Department of Health & Human Services, and, which sources content from all federal, state, local, tribal, and territorial government publication portals (.gov, .mil, .edu). Funding for and content contributors is made possible from the U.S. Congress, E-Government Act of 2002.
Crowd sourced content that is contributed to World Heritage Encyclopedia is peer reviewed and edited by our editorial staff to ensure quality scholarly research articles.
By using this site, you agree to the Terms of Use and Privacy Policy. World Heritage Encyclopedia™ is a registered trademark of the World Public Library Association, a non-profit organization.

Copyright © World Library Foundation. All rights reserved. eBooks from Project Gutenberg are sponsored by the World Library Foundation,
a 501c(4) Member's Support Non-Profit Organization, and is NOT affiliated with any governmental agency or department.